This study addresses the link between overeducation and intention to migrate to the Greater Bay Area (GBA) cities in mainland China in a sample of Hong Kong’s young adults employed in lower occupational classes (elementary occupations, plant and machine operators and assemblers, craft and related workers, and service and sales workers). The results indicate that overeducation has a unique negative effect on attitudes towards migration to GBA. The findings suggest that social capital theory rather than human capital theory is better able to explain the motivation of Hong Kong’s young people to invest in higher education. This research may help policy makers review the expansion of higher education in Hong Kong and provide valuable policy implications for regional integration between Hong Kong and mainland China. Copyright © 2021 Informa UK Limited, trading as Taylor & Francis Group.